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Vista - -ne operator

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Old 11-23-2008   #1 (permalink)
Simon Walsh


 
 

-ne operator

Hi

I have a script that accepts an argument from the user. There are four
possible values that I wish the user to pass to the script. I wil then take
different actions based on the argument passed.
If I do not get one of those values I want to error out. I am not really
sure how to use the the operators.

What I have so far

$Input = $args[0]
If ($Input -ne "1")
{
Write-Host "Error"
Break
}

So here I will break out if I do not get 1 as an input. I also want to error
out if I don't get 2, 3 or 4.

I have tried:
If ($Input -ne "1" -ne "2" -ne "3" -ne "4")
{
Write-Host "Error"
Break
}
but that doesn't work..

Anyone have any tips?

Thanks
Simon



My System SpecsSystem Spec
Old 11-23-2008   #2 (permalink)
David Muegge


 
 

Re: -ne operator

Simon Walsh wrote:
Quote:

> Hi
>
> I have a script that accepts an argument from the user. There are four
> possible values that I wish the user to pass to the script. I wil then take
> different actions based on the argument passed.
> If I do not get one of those values I want to error out. I am not really
> sure how to use the the operators.
>
> What I have so far
>
> $Input = $args[0]
> If ($Input -ne "1")
> {
> Write-Host "Error"
> Break
> }
>
> So here I will break out if I do not get 1 as an input. I also want to error
> out if I don't get 2, 3 or 4.
>
> I have tried:
> If ($Input -ne "1" -ne "2" -ne "3" -ne "4")
> {
> Write-Host "Error"
> Break
> }
> but that doesn't work..
>
> Anyone have any tips?
>
> Thanks
> Simon
>
>
Simon,

I would look at the switch statement

Something like this

switch ($input) {

1 {"It’s one"}

2 {"It’s two"}

3 {"It’s three"}

4 {"It’s four"}

default {"Wrong Answer"}
}

Place whatever code you want to execute for each condition in the
corresponding script block.

Regards,

David Muegge
My System SpecsSystem Spec
Old 11-23-2008   #3 (permalink)
tojo2000


 
 

Re: -ne operator

On Nov 23, 7:49*am, David Muegge <da...@xxxxxx> wrote:
Quote:

> Simon Walsh wrote:
Quote:

> > Hi
>
Quote:

> > I have a script that accepts an argument from the user. There are four
> > possible values that I wish the user to pass to the script. I wil then take
> > different actions based on the argument passed.
> > If I do not get one of those values I want to error out. I am not really
> > sure how to use the the operators.
>
Quote:

> > What I have so far
>
Quote:

> > $Input = $args[0]
> > If ($Input -ne "1")
> > {
> > Write-Host "Error"
> > Break
> > }
>
Quote:

> > So here I will break out if I do not get 1 as an input. I also want to error
> > out if I don't get 2, 3 or 4.
>
Quote:

> > I have tried:
> > If ($Input -ne "1" -ne "2" -ne "3" -ne "4")
> > {
> > Write-Host "Error"
> > Break
> > }
> > *but that doesn't work..
>
Quote:

> > Anyone have any tips?
>
Quote:

> > Thanks
> > Simon
>
> Simon,
>
> I would look at the switch statement
>
> Something like this
>
> switch ($input) {
>
> * * * * 1 {"It’s one"}
>
> * * * * 2 {"It’s two"}
>
> * * * * 3 {"It’s three"}
>
> * * * * 4 {"It’s four"}
>
> * * * * default {"Wrong Answer"}
>
> }
>
> Place whatever code you want to execute for each condition in the
> corresponding script block.
>
> Regards,
>
> David Muegge
Another option would be to create an array of valid values like this:

$valid_values = 'one', 'two', 'three', 'radio'

if ($valid_values -notcontains $user_input) {
Write-Error 'Invalid Entry'
}
My System SpecsSystem Spec
Old 11-23-2008   #4 (permalink)
Simon Walsh


 
 

Re: -ne operator

Thanks for the answers guys
I will try them both out

/Simon
"tojo2000" <tojo2000@xxxxxx> wrote in message
news:be02a293-d1ab-4c57-aeca-33e8b9558d1f@xxxxxx
On Nov 23, 7:49 am, David Muegge <da...@xxxxxx> wrote:
Quote:

> Simon Walsh wrote:
Quote:

> > Hi
>
Quote:

> > I have a script that accepts an argument from the user. There are four
> > possible values that I wish the user to pass to the script. I wil then
> > take
> > different actions based on the argument passed.
> > If I do not get one of those values I want to error out. I am not really
> > sure how to use the the operators.
>
Quote:

> > What I have so far
>
Quote:

> > $Input = $args[0]
> > If ($Input -ne "1")
> > {
> > Write-Host "Error"
> > Break
> > }
>
Quote:

> > So here I will break out if I do not get 1 as an input. I also want to
> > error
> > out if I don't get 2, 3 or 4.
>
Quote:

> > I have tried:
> > If ($Input -ne "1" -ne "2" -ne "3" -ne "4")
> > {
> > Write-Host "Error"
> > Break
> > }
> > but that doesn't work..
>
Quote:

> > Anyone have any tips?
>
Quote:

> > Thanks
> > Simon
>
> Simon,
>
> I would look at the switch statement
>
> Something like this
>
> switch ($input) {
>
> 1 {"It’s one"}
>
> 2 {"It’s two"}
>
> 3 {"It’s three"}
>
> 4 {"It’s four"}
>
> default {"Wrong Answer"}
>
> }
>
> Place whatever code you want to execute for each condition in the
> corresponding script block.
>
> Regards,
>
> David Muegge
Another option would be to create an array of valid values like this:

$valid_values = 'one', 'two', 'three', 'radio'

if ($valid_values -notcontains $user_input) {
Write-Error 'Invalid Entry'
}


My System SpecsSystem Spec
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